Engineering :: Renewable Sources of Energy

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Energy may be defined as

A.	the capacity to do work	B.	the product of mass and acceleration
C.	the rate of doing work	D.	the product of force and velocity

Sun radiates energy to the earth

A.	in the form of electromagnetic radiation	B.	at a relatively constant rate of 3.83 x 1026 W
C.	24 hours per day 365 day of the year	D.	all of the above

Most of the electromagnetic radiation reaching the earth emanates from the

A.	corona	B.	chromoshpere
C.	photoshere	D.	suns interior

Compared to the photosphere the corona region is characterized by

A.	low density gas misture	B.	higher temperature
C.	variation in energy and diameter with time	D.	all of the above

The angle subtended by a vertical line to the zenith (i.e. the point direct5ly overhead) and the line of sight to the sun is called

A.	zenth angle	B.	declination angle
C.	hour angle	D.	iatitude angle

The solar radiation at sea level corresponds to an air mass value of

A.	0	B.	1
C.	2	D.	3

Solar photovoltaic energy sources produce

A.	AC electricity	B.	DC electricity
C.	both and a and b	D.	neither a nor b

The two major consitituents of the sun are

A.	helium and hydrogen	B.	oxygen and nitrogen
C.	helium and carbon dioxide	D.	oxygen and hydrogen

The two major consitituents of the sun are helium and hydrogen. The percentage of the helium by volume in the sun is about

A.	74	B.	25
C.	99	D.	52

10.

The sun exists in a state of equilibrium between the force of gravitation and

A.	the outward radiation pressure from fusion reactions	B.	the outward force due to nuclear fission
C.	the centrifugal force due to its rotation	D.	none of the above